Marcel Sabin Popa
The paper presents some new measurements and instrumentation paying a special attention to the thermal behaviour of modern manufacturing systems. Acording to a CIRP evaluation, more than 50% of the machining errors, even in the case of modern machine tools, are due to the thermal phenomena. The study of thermal behaviour for machine tools is very important for precision processing, e.g. grinding. The problem is more complicated due to thermal field variations in space and time. The studies and the tests carried out (the thermography used by the author for the first time in Romania) were...
XIX IMEKO World Congress
· TC12
· 2009
· Download
Camilo Quintáns Graña, Jorge Marcos Acevedo, Ana Maria Cao y Paz, María José Graña Caneiro
This work presents results in measurement density in grape juice by mean of fiber optic sensors. This measure, which provides alcohol level in the fermentation process, has several problems that are shown as a limitation of these kinds of sensors in practical applications.
XIX IMEKO World Congress
· TC23
· 2009
· Download
Jin Wan Chung, Sungjun Lee, Kwang Pyo Kim
The kilogram is unique among the base SI units in being the only one defined by an artefact. A major problem with maintaining the traceability of the mass scale is the inherent instability of the kilogram artefacts. To resolve the problem, there had been done a comparison of the values of the national standard kilogram of 18 European National Metrology Institutes (NMIs) by National Physical Laboratory (NPL) in England. The similar comparison in APMP is needed to plan as a pilot study. The ten institutes of APMP are participated in this pilot study. KRISS in Korea and NMC/ASTAR in Singapore...
XIX IMEKO World Congress
· TC3
· 2009
· Download
J. Muzik, M. Tysler, P. Kneppo, V. Rosik, S. Karas, E. Heblakova
In this paper a real-time data acquisition, visualization and signal processing software and an inverse-problem-solving method enabling non-invasive location of bioelectric sources in the heart are presented. Complete solution also consists of a portable measuring unit connected to a personal computer on which the software is running. Acquisition and real-time processing and visualization software LiveMap is a client-server software for MS Windows. This modular open source software package provides real-time 2D and 3D visualization of various types of data mapped directly to a human chest...
XIX IMEKO World Congress
· TC13
· 2009
· Download
Jörg Seewig, Tobias Hercke
Typically, a car has over 80 dynamically stressed seals. Since many years, the radial seal in combination with the shaft is a critical component for the automotive industry. A helix-like structure due to the manufacturing process (as a fingerprint of said process) can lead to an unacceptable oil consumption. In collaboration with Daimler, an objective method for characterising such function-relevant helix-structures better known as lead was developed. The lead parameters, which are relevant to leak-tightness, are derived from a least square fit of complex exponential functions in both...
XIX IMEKO World Congress
· TC14
· 2009
· Download
Giovanni Betta, Domenico Capriglione, Luigi Ferrigno, Gianfranco Miele
The modern measurement instruments involved in telecommunication systems are generally based on suitable digital signal processing methods which provide the desired quantities by elaborating the digitized samples. To meet the accuracy and repeatability required by the telecommunication applications and to warrant the alias-free sampling ( Nyquist-Shannon theorem), the measurement instruments are usually forced to operate with high sampling frequencies, long observation periods and very fast measurement algorithms. It is worth noting that fixed the observation period, a reduction in the...
XIX IMEKO World Congress
· TC4
· 2009
· Download
Evelyn de F. Guimarães, Eliane Cristina Pires do Rego, Helen Cristine Moreira Cunha, Janaína M. Rodrigues, José Daniel Figueroa Villar, Valnei Smarçaro da Cunha
The objective of this work was to study the homogeneity of the lot of the candidate certified reference material (CRM) composed of 16 polycyclic aromatic hydrocarbons (PAHs) in toluene, with the purpose of evaluating the degree of homogeneity among its units and within a same unit, evaluating the uncertainty contribution of homogeneity to the certified value. The method used complies with ISO Guide 30 series, being the ANOVA the statistical tool used to evaluate the variability among and within units. According to the statistical parameters, the homogeneity of the candidate PAHs CRM was...
XIX IMEKO World Congress
· TC24
· 2009
· Download
Angelo Basteris, Gabriele Vigo, Carmelo Lentino, Vittorio Sanguineti
We developed a protocol for the assessment of manual wheelchair set-up and propulsion in a common clinical motion analysis laboratory. We also designed a device to detect hand contact on handrim. In a first phase, we took anthropometric and wheelchair geometric measures. Later, subjects propelled the wheelchair and, based on the experimental data on subjects' movements and their effect on wheelchair velocity, we identified a number of indicators for performance in wheelchair push. We show that these indicators clearly distinguish between experienced and novice users.
XIX IMEKO World Congress
· TC18
· 2009
· Download
Aliye Kartal Dogan, Ali Uytun, Murat Kalemci, Kursat Ozdemir
A national interlaboratory comparison on thermometry field was carried out between the temperature range was -40 °C and 420 °C according to International Temperature Scale of 1990 (ITS-90) with the co-operation of TURKAK (Turkish Accreditation Agency) and TUBITAK – UME (National Metrology Institute of Turkey). 14 national laboratories were participated in this interlaboratory comparison. The details and the results of this national comparison will be given in this paper.
XIX IMEKO World Congress
· TC12
· 2009
· Download
S. Moustafa, N. Gerwien, F. Haertig, K. Wendt
The accuracy of coordinate measuring machines (CMMs) strongly depends on geometrical errors that effect the measurements. Several methods for mapping these errors have been developed and some have been implemented. Examples are the direct measurement analysis by means of interferometers, straight edges, squareness standards or the analysis by application of artefacts like ball or hole plates or by using the multilateration approach using high accurate tracking laser interferometers. In this paper a comparison between the well established ball or hole plate method against the new...
XIX IMEKO World Congress
· TC21
· 2009
· Download